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Java Online Compiler

Practice Java using this online Java interpreter. Run Java code within your browser without downloading any software.

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Java Programming Language

Java is a widely used class-based, object-oriented, concurrent & secure computer programming language. It is easier to write, compile & debug code in Java compared to other similar languages.Java's object oriented model enables code reusability, which, in turn, helps create modular programs.

One of Java's most significant advantages is its ability to easily transition from one computer system to another with the help of the Java Bytecode. The ability to run the same programme on multiple platforms is critical for World Wide Web software, and Java achieves this by being platform-independent at both the source and binary levels.

Top companies using Java:

  • Uber
  • Airbnb
  • Google
  • Pinterest
  • Netflix
  • Instagram
  • Spotify
  • Amazon

Compiler Vs Interpreter

Java code is considered to be both compiled & interpreted. During the build process, the Java source code is first compiled into bytecode. The generated bytecode is then interpreted by the JVM for execution. Java applications are called WORA (Write Once Run Anywhere), which signifies that a programmer can develop Java code on one system & expect it to run on any other java-enabled system out of the box. This is all possible because of the Java Virtual Machine (JVM), which converts Java source code to bytecode.


A computer program that translates code written in one programming language into another. Primarily, compilers are programs that convert source code written in a high-level programming language to a lower-level programming language, such as machine code, for creating an executable program.


A computer program that directly executes the instructions of a high-level language. The interpreter transforms the high-level program into an intermediate language that it then executes, or it could parse the high-level source code and then performs the commands directly, which is done line by line.

Because of the bytcode, Java code is a much more portable than C++ code. Java is a dynamic programming language where modification to the existing program can safely be made, unlike C++. All primitive data types in Java are predefined & not platform dependent, whereas in C or C++, some data types can change depending on the platform used. Java programs are also more structured than C++ programs

Codedamn Java Compiler

The codedamn online compiler utilizes the power of cloud computing to give you a fast and reliable coding experience. When you boot the online java compiler, a docker container is started on a remote linux computer. This docker container is already setup to compile and interpret your java into bytecode and check for any errors or problems. As the code is executed, the output / errors will show up on the integrated terminal of the online java compiler.

Try out the Java online compiler

To get started, type your java code into the file. For example,

// Java program to check if a string is a palindrome

class script {
	public static void main(String[] args) {
	  String str = "Radar", reverseStr = "";
	  int strLength = str.length();
	  for (int i = (strLength - 1); i >=0; --i) {
		reverseStr = reverseStr + str.charAt(i);
	  if (str.toLowerCase().equals(reverseStr.toLowerCase())) {
		System.out.println(str + " is a palindrome string.");
	  else {
		System.out.println(str + " is not a palindrome string.");

You can now run your Java code through the terminal. Type in:

javac && java script

This will produce the bytecode for the file and execute it

javac && java script
Radar is a Palindrome String.

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